眼科領域における医用縫合糸の伸長特性

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Tension-strain curves of surgical sutures with very small diameters used for ophthalmology, were measured. Materials are eight kinds of surgical suture ; Dexon ( polyglycolic acid : absorbable, synthetic, braided ). Coated Vicryl ( polyglactin 910 : a, s, b ), PDS ( polydioxanone : a, s, monofilament ), Plain gut ( catgut : a, natural, m ). Chromic gut ( catgut : a, n, m ), Silk ( Nonabsorbable, n, b ), Prolene ( polypropylene : N, s, m ), Ethilon ( nylon 66 : N, s, m ). Measurements of tension-strain curve were carried out at 37±0.5°C under a dry condition of 70-80% relative humidity in air and under a wet condition in Ringer's solution, respectively. Dexon showed the maximum breaking strength and Prolene showed the maximum breaking strain in all the sutures under both wet and dry conditions. The breaking strength for all the sutures were lower in the wet condition than in the dry condition. The yield stresses of Dexon and Coated Vicryl were about 31.7g/mm2, that were much less than their breaking stresses. ( J. Jpn. Soc. Biorheol., 2 (3), 142~148, 1988 ).
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